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SWV voltammograms of modified ITO electrodes with different architectures of AuNPs and 4-thiolphenyl as indicated in the inserted sketch of (a,b), The measurements were recorded at a scan rate of 10 mV s−1, in aqueous solution of KNO3 (10−1 M) free of Cu2+ and after immersion in Cu2+ solution of the indicated concentration.
